duct less mini split sizing

[atufano]

Are there any special considerations when sizing mini splits for homes? I've been told there are.

This is what I have. I have a small home with no attic.

2 Rooms connected by a doorway.

Walls = R19
Ceiling = R30
Floor=Carpet

Home is covered in shade

NW=42.21 Double pane
NE= 20 Metal / Foam core door /solid w/storm
29.38 double pane
SE= 17.77 Metal / Foam core door /solid w/storm
5.5 Double Pane
SW= 37.04 Doule Pane

Room 1 is 34 x 15 x 8 Kit/Liv
Room 2 is 21 x 15 x 8 Bed/bath

I came up with 9000 btu's for Room1 and 7000 for room 2. Or 1.5 for the whole home.


[Edited by atufano on 07-09-2005 at 02:06 PM]

[igwt777]

In my opinion minisplit are overrated in terms of capacity BTUH.

[johnsp]

2 seperate rooms is the issue. You'll never get the second room at the same temp through a doorway. Maybe a 2 zone unit with 2 evaporators, one for each room (9K BTU each), these are pricey.

[Freezeking2000]

You could use one of those small doorway fans that mount in the corner of the door.

[atufano]

Originally posted by johnsp
2 seperate rooms is the issue. You'll never get the second room at the same temp through a doorway. Maybe a 2 zone unit with 2 evaporators, one for each room (9K BTU each), these are pricey.

That is what I suggested, by when you try to route the lineset over, it gets ugly. and the customer wants the discrete look. Plus the supply house wanted to put in a 1 ton unit in that one room. So I suggested we do the one (easy) room and then worry about the other one later.

[Edited by atufano on 07-09-2005 at 02:31 PM]

[johnsp]

The 9K BTU units are not that costly. I can pick up 2 units for less then a single 2 zone model. More electric wiring and you need the added footprint for the 2nd condenser.